Changes
/* Process-flow for patent analysis */
*'''Stimulation''': Stimulation, fracturing etc.
[[Image:Process-flow steps for patent analysis .jpg|centre|thumb|600px|Process-flow for patent analysis]]
===Insights from patent analysis===
All the patents obtained from the database were filtered to find out the most relevant patents, this process included going through the full text of the patent. A total of 125 relevant patents related to stimulation technique for tight gas formations were found. This was followed by a detailed analysis of the relevant records. All the patents were analyzed to capture the focus of the patent, stimulation technique described in the invention and the fracturing ingredients used in the invention. The analyses of the patents lead to following observations:
====Top Assignees====
Schlumberger tops the assignee chart with 32 patents related to tight gas stimulation followed by Exxonmobil and Halliburton. 3M has filed its patent in collaboration with Univ of texas. Sclumberger too have filed some patents in collaboration with Prad Research Institute. Hill Gilman tops the top inventors chart with 4 patents related to tight gas stimulation followed by Kaminsky Robert and Fu, Diankui.
[[Image:doc1.jpeg|center|500px]]
[[Image:doc2.jpeg|center|500px]]
===IP Activity===
[[Image:IP activity pub year.jpg|center|500px]]
The publications of patents in the last were nearly stagnant till 2007 after which one can witness a sudden surge in publication related to tight gas stimulation. For the years 1997 and 2001 there was no publication of patents related to tight gas stimulation. The last 3 years (2008-2011) has witnessed a sudden growth of publication activity, the highest being in 2011 with 35 patents published.
[[Image:IP activity prio year.jpg|center|500px]]
The IP activity by priority year saw a sudden surge in activity in the year 1994 and thereafter from 2005 onwards, where a significant IP activity was observed. The numbers are more likely to change when patents claiming priority over the last 20 years are published. There was no IP activity observed in the year 1996.
====Geographical Distribution of patents====
a) By unique families
Since the unique family retrieved from Thomson Innovation Database was downloaded by keeping US as a first priority, hence one can see that US leads in the chart with 109 patents
[[Image:doc3.jpeg|center|500px]]
b) Total patent families filed across the globe
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As shown in the above figure, United States has the highest filing of the 514 patent families filed across the globe. China is the only country in Asia to have filed patents related to tight gas stimulation. The filing spread is seen across North and South America, Europe, Russia and Australia.PCT filing also remains an important choice of assignees when it comes to filing patent globally.
==Technology and Scientific Information Search Strategy==
A search for extracting scientific articles was conducted.
'''Database used''': Engineering Village (Compendex)
'''Search strategy''': (Fracturing or Stimulation) AND (Tight gas)
'''Scope''': Subject/Title/Abstract
'''Years Searched''': 1990-2012
'''Date of search''': 02nd January 2012
'''Criteria for filtering''': Only those articles related to stimulation or fracturing techniques for tight gas recovery were considered as relevant. Articles related to modeling were considered as OFF target documents. Duplicate articles were removed. There were around 24 duplicate articles.
=Taxonomy for patent analysis for tight gas recovery=
<mm>[[Tight Gas Recovery Analysis Taxonomy12.mm|800px|Interactive Mindmap|center|title Taxonomy for patent analysis]]</mm>
